Vacuum flask



FIG. 1 is a perspective view of vacuum flask showing my new design thereof;

FIG. 2 is a front elevational view and the rear elevational view being a mirror image thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a vacuum flask, as shown and described. 